import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/map';
import { Task } from '../../pages/tasklist/task';

@Injectable()
export class HttpDataProvider {

  private readonly baseUrl: string = 'https://api2.bmob.cn/1';
  private readonly httpOptions : Object = {
    headers : new HttpHeaders({
      'X-Bmob-Application-Id':'dcd530e18f500e95de2de1306922ba45',
      'X-Bmob-REST-API-key':'d8e39910285cebf2175386be26d58827',
      'Content-Type': 'application/json',
    })
  };

  constructor(public http: HttpClient) {
    console.log('获取HTTP数据服务加载');
  }


  /**
   * 获取待办事项列表
   * @returns {Observable<Task[]>}    待办事项列表数据集合
   */
  getTaskList(): Observable<Task[]>{
    return this.http.get<Task[]>(`${this.baseUrl}/classes/ToDoList`,this.httpOptions).map(data => data["results"]);
  }

  /**
   * 更新指定待办事项
   * @param task 
   * @returns {Observable<Task[]>}   响应结果
   */
  updateTask(task : Task): Observable<Task>{
    let _task = {title: task.title, status: task.status, description: task.description};
    return this.http.put<Task>(`${this.baseUrl}/classes/ToDoList/${task.objectId}`, _task, this.httpOptions);
  }

  /**
   * 删除指定待办事项
   * @param task 
   */
  deleteTask(task : Task): Observable<{}>{
    return this.http.delete(`${this.baseUrl}/classes/ToDoList/${task.objectId}`,this.httpOptions);
  }

}
